How to replace LCD backlight for laptops

My sister bought a Compaq laptop a couple years ago and its LCD has gone bad.  When external monitor was plugged in, it works fine so it was something related to LCD.  I found some articles online describing the same issue and determined that I have 2 options.  Option 1. buy a new LCD for about $150.  Option 2. identify a bad part and replace it under $20.  Since I like experimental stuff I decided to try Option 2!!

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